Dell E228WFPc Service Manual page 21

22"LCD Color Monitor
When bright area in a sub-pixel(red or blue) exceed half size of a sub-pixel, that sub-pixel can be counted as a
bright dot.
When bright area in a sub-pixel(green) exceed a third size of a sub-pixel, that sub-pixel can be counted as a bright
dot.
Oval and undefined shape of Partial dot is defined as height of dot.
When bright area in a sub-pixel (R, B) is under 20% of a sub-pixel, that sub-pixel can be ignored.
When bright area in a sub-pixel (G) is under 10% of a sub-pixel, that sub-pixel can be ignored.
(2) Display Inspection
Defect Type
Dark / bright spot
(foreign material,Stain,Dust)
Bright line (light lint), or
dark line (dark lint / hair)
Polarizer scratch
Polarizer dent/bubble
Maximum allowable number of defects
*1
Accept (mm)
0.3 < D ≤ 0.7
N ≤ 5
0.01 < W ≤ 0.1
0.3 < L ≤ 7.0
N ≤ 3
0.01 < W ≤ 0.1
0.3 < L ≤ 7.0
N ≤ 3
0.3 < D ≤ 0.7
N ≤ 5
N ≤ 8
21
Dell E228WFPc
Reject (mm)
D > 0.7
N > 5
W> 0.1
L >7.0
N > 3
W > 0.1
L > 7.0
N > 3
D > 0.7
N > 5
N > 8